Question

Va rog este tare urgent! Descompuneti in factori expresiile urmatore utilizand, eventual, identitatile. Nu raspundeti aiurea!!

Answer 1

Răspuns:

a) $x^{2} + 6x+8= (x+2) (x+ 4)=$$x^{2}$ +2x+4x+8 = $x^{2}$+ (2+4)x +2*4

b) $x^{2} -10x+9$= (x- 9)(x-1) = $x^{2} -(9+1)x + 9*1$

c) $x^{2}$ -20x+96= (x- 8) (x-12)= $x^{2}$ - (8+12)$x$ + 8*12

d) $x^{2}$- 8x- 9=(x +1) (x-9)= $x^{2}$ - (1-9)$x$ -9*1

e) $x^{2}$- 14x+ 24= (x-2 )(x- 12)= $x^{2} -$(2+12)$x$ +2*12

f) $x^{2}$- 7x + 10= (x-2) (x-5)= $x^{2} - (2+5)x + 2*5$

g)  $x^{2}$- 15x+ 56= (x-7)(x-8)= $x^{2} - (7+8)x +7*8$

h)  $x^{2}$+ 23x + 60= (x+ 20)(x+3)= $x^{2} +(20+3)x +20*3$

i) $x^{2}$+ 17x - 60=(x-3) (x+20) = $x^{2} + (20-3) x - 3*20$